A026982 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026670.

1, 6, 24, 120, 460, 2214, 8475, 40164, 154235, 724742, 2792579, 13050280, 50432693, 234766510, 909442512, 4221139640, 16384219216, 75873259406, 294977735364, 1363503281324, 5308113306398, 24499364386598, 95483014454706, 440147035814920, 1717035728143720, 7906666535747934

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Oct 20 2019